#include <rtdevice.h>

/* 定义LCD设备结构体 */
struct lcd_device
{
    struct rt_device parent;  // 必须包含父设备结构
    // 这里可以添加LCD特有的成员变量
};

/* 设备操作函数实现 */
static rt_err_t lcd_init(rt_device_t dev)
{
    // 初始化LCD硬件
    return RT_EOK;
}

static rt_err_t lcd_open(rt_device_t dev, rt_uint16_t oflag)
{
    // 打开设备时的操作
    return RT_EOK;
}

static rt_err_t lcd_close(rt_device_t dev)
{
    // 关闭设备时的操作
    return RT_EOK;
}

static rt_ssize_t lcd_read(rt_device_t dev, rt_off_t pos, void *buffer, rt_size_t size)
{
    // 读取操作(对于console可能不需要)
    return 0;
}

static rt_ssize_t lcd_write(rt_device_t dev, rt_off_t pos, const void *buffer, rt_size_t size)
{
    // 写入操作 - 将数据输出到LCD
    const char *str = buffer;
    for (rt_size_t i = 0; i < size; i++)
    {
        // 在这里实现字符输出到LCD的逻辑
        // 例如: lcd_put_char(str[i]);
    }
    return size;
}

static rt_err_t lcd_control(rt_device_t dev, int cmd, void *args)
{
    // 控制命令处理
    return RT_EOK;
}

/* 注册LCD设备 */
int lcd_device_init(void)
{
    struct lcd_device *lcd_dev;
    
    /* 创建设备实例 */
    lcd_dev = rt_malloc(sizeof(struct lcd_device));
    if (lcd_dev == RT_NULL)
    {
        return -RT_ENOMEM;
    }
    
    /* 初始化设备 */
    lcd_dev->parent.type    = RT_Device_Class_Char;
    lcd_dev->parent.init    = lcd_init;
    lcd_dev->parent.open    = lcd_open;
    lcd_dev->parent.close   = lcd_close;
    lcd_dev->parent.read    = lcd_read;
    lcd_dev->parent.write   = lcd_write;
    lcd_dev->parent.control = lcd_control;
    
    /* 注册设备 */
    rt_device_register(&lcd_dev->parent, "lcd", RT_DEVICE_FLAG_RDWR);
    
    /* 设置为控制台设备 */
    // rt_console_set_device("lcd");
    
    return RT_EOK;
}
INIT_DEVICE_EXPORT(lcd_device_init);